Updates Zoom bubble layout and adds +/- buttons

chrome/browser/ui/views/location_bar/location_bar_view.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/location_bar/location_bar_view.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/i18n/rtl.h"
@@ skipping 302 matching lines @@
 }
 
 void LocationBarView::ZoomChangedForActiveTab(bool can_show_bubble) {
   DCHECK(zoom_view_);
   if (RefreshZoomView()) {
     Layout();
     SchedulePaint();
   }
 
   WebContents* web_contents = GetWebContents();
-  if (can_show_bubble && zoom_view_->visible() && web_contents)
+  // Zoom bubble may be present without its corresponding decoration
+  // |zoom_view_| such as when using + or - buttons in the bubble to
+  // set the zoom to 100%. When either is visible, show or update the
+  // bubble contents.
+  if (can_show_bubble && web_contents &&
+      (zoom_view_->visible() || ZoomBubbleView::GetZoomBubble())) {
     ZoomBubbleView::ShowBubble(web_contents, gfx::Point(),
                                ZoomBubbleView::AUTOMATIC);
+  }
 }
 
 void LocationBarView::SetStarToggled(bool on) {
   if (star_view_)
     star_view_->SetToggled(on);
 }
 
 gfx::Point LocationBarView::GetOmniboxViewOrigin() const {
   gfx::Point origin(omnibox_view_->origin());
   origin.set_x(GetMirroredXInView(origin.x()));
@@ skipping 705 matching lines @@
 // LocationBarView, private TemplateURLServiceObserver implementation:
 
 void LocationBarView::OnTemplateURLServiceChanged() {
   template_url_service_->RemoveObserver(this);
   template_url_service_ = nullptr;
   // If the browser is no longer active, let's not show the info bubble, as this
   // would make the browser the active window again.
   if (omnibox_view_ && omnibox_view_->GetWidget()->IsActive())
     ShowFirstRunBubble();
 }